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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (1,413,621) | $ (1,269,652) | $ (1,339,772) | $ (1,416,048) | $ (1,364,716) | $ (1,357,075)
Private Education Loans, net | 20,459,933 |  | 20,306,357 |  |  |
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 21,777,466 |  | 21,025,844 |  |  |
Deferred origination costs and unamortized premium/(discount) | 96,088 |  | 81,554 |  |  |
Allowance for credit losses | (1,413,621) |  | (1,335,105) |  |  |
Private Education Loans, net | 20,459,933 |  | 19,772,293 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 16,510,149 |  | 13,985,791 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 5,267,317 |  | 7,040,053 |  |  |
FFELP Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 0 |  | 537,401 |  |  |
Deferred origination costs and unamortized premium/(discount) | 0 |  | 1,330 |  |  |
Allowance for credit losses | 0 |  | (4,667) |  |  |
Private Education Loans, net | $ 0 |  | $ 534,064 |  |  |

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